Right. I am not sure what the problem is but there are a few things you can try:
- Turn off OneDrive or any cloud storage software that uses the Documents directory
- Turn off any anti-virus software other than Defender
- Turn off Controlled Folder Access if it’s enabled (see this topic)
- Make sure the disk is not full
- Do a clean reinstall of Zwift
If you’re not able to resolve it, contact support